/*
 * This file is part of aion-engine <aion-engine.com>
 *
 * aion-engine is private software: you can redistribute it and or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Private Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * aion-engine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with aion-engine.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.aionengine.gameserver.ai2.handler;

import com.aionengine.gameserver.ai2.AIState;
import com.aionengine.gameserver.ai2.AbstractAI;
import com.aionengine.gameserver.ai2.NpcAI2;
import com.aionengine.gameserver.ai2.event.AIEventType;
import com.aionengine.gameserver.ai2.manager.EmoteManager;
import com.aionengine.gameserver.model.gameobjects.Creature;
import com.aionengine.gameserver.model.gameobjects.VisibleObject;
import com.aionengine.gameserver.utils.MathUtil;

/**
 * @author ATracer
 */
public class FollowEventHandler {

    /**
     * @param npcAI
     * @param creature
     */
    public static void follow(NpcAI2 npcAI, Creature creature) {
        if (npcAI.setStateIfNot(AIState.FOLLOWING)) {
            npcAI.getOwner().setTarget(creature);
            EmoteManager.emoteStartFollowing(npcAI.getOwner());
        }
    }

    /**
     * @param npcAI
     * @param creature
     */
    public static void creatureMoved(NpcAI2 npcAI, Creature creature) {
        if (npcAI.isInState(AIState.FOLLOWING)) {
            if (npcAI.getOwner().isTargeting(creature.getObjectId()) && !creature.getLifeStats().isAlreadyDead()) {
                checkFollowTarget(npcAI, creature);
            }
        }
    }

    /**
     * @param creature
     */
    public static void checkFollowTarget(NpcAI2 npcAI, Creature creature) {
        if (!isInRange(npcAI, creature)) {
            npcAI.onGeneralEvent(AIEventType.TARGET_TOOFAR);
        }
    }

    public static boolean isInRange(AbstractAI ai, VisibleObject object) {
        if (object == null) {
            return false;
        }
        return MathUtil.isIn3dRange(ai.getOwner(), object, 2);
    }

    /**
     * @param npcAI
     * @param creature
     */
    public static void stopFollow(NpcAI2 npcAI, Creature creature) {
        if (npcAI.setStateIfNot(AIState.IDLE)) {
            npcAI.getOwner().setTarget(null);
            npcAI.getOwner().getMoveController().abortMove();
            npcAI.getOwner().getController().scheduleRespawn();
            npcAI.getOwner().getController().onDelete();
        }
    }
}
